| Brass Turned Parts Limited | Extraterritorial | 1956 |
| Brave GB Limited | Manufacturing | 2008 |
| Brave Pharma Ltd | Health & social care | 2023 |
| Bread and Blue Limited | Manufacturing | 2025 |
| Breakthru Care Ltd | Real estate | 2016 |
| Breakwells Coatings and Paints Limited | Wholesale & retail | 2024 |
| Breakwells Glass Limited | Administrative & support | 1983 |
| Breakwells Paints Limited | Wholesale & retail | 2001 |
| Bree & Brothers Metals Ltd | Wholesale & retail | 2025 |
| Breeze Decorators Limited | Construction | 2024 |
| Brelmayne Holdings Limited | Financial services | 2014 |
| Brelmayne Limited | Construction | 2008 |
| Bren-Fen Ltd | Construction | 2018 |
| Brennan Industries of Europe Limited | Administrative & support | 2016 |
| Brennan Scaffolding Ltd | Construction | 2021 |
| Brenprop Ltd | Real estate | 2022 |
| Breson Family(Investment)Company Limited | Real estate | 1963 |
| Brexit Commercials Ltd | Extraterritorial | 2020 |
| Briah Couriers Ltd | Transport & logistics | 2019 |
| Brian Lowndes Print Limited | Manufacturing | 1967 |
| Bric Developments Limited | Construction | 2023 |
| Bric Holdings Limited | Real estate | 2018 |
| Bric Management NW Limited | Real estate | 2021 |
| Bric Supplies Limited | Wholesale & retail | 2024 |
| Bricbase Investments Limited | Real estate | 2022 |
| Brice Investments Ltd | Wholesale & retail | 2022 |
| Brichimon Limited | Wholesale & retail | 2020 |
| Brickhouse Sistems Ltd | Construction | 2023 |
| BRICKS2LETS Ltd | Real estate | 2023 |
| Brickstone Properties Limited | Real estate | 2019 |
| Briclectric Investments Limited | Real estate | 2024 |
| Bricture Investments Limited | Real estate | 2023 |
| Bridge Road 1 Investments 2 Limited | Real estate | 2025 |
| Bridge Road 1 Investments Limited | Real estate | 2021 |
| Bridge Road 1 Ltd | Wholesale & retail | 2018 |
| Bridgeman Car Care Ltd | Wholesale & retail | 2023 |
| Bridgesolve Ltd | Wholesale & retail | 2026 |
| Bridgnorth Stores Ltd | Wholesale & retail | 2021 |
| Bright Beginnings Educational Limited | Wholesale & retail | 2025 |
| Bright Home Consultancy Ltd | Professional & scientific | 2019 |
| Bright Living Homes Ltd | Health & social care | 2021 |
| Bright Living Services CIC | Hospitality | 2024 |
| Bright Path Training Academy Ltd | Information & communication | 2026 |
| Bright Path Tuition Centre Ltd | Education | 2026 |
| Bright Reach Investments Limited | Real estate | 2024 |
| Bright Solutions Walsall Limited | Administrative & support | 2025 |
| Bright Spark Electrical (Midlands) Ltd | Construction | 2022 |
| Bright Star Recruits Ltd | Administrative & support | 2019 |
| Bright Supported Housing Ltd | Hospitality | 2025 |
| Brightlink Communications Ltd | Information & communication | 2025 |
| Brightstone Construction Group Ltd | Construction | 2024 |
| Brightwater Limited | Transport & logistics | 2002 |
| Brilliant Insight and Training Limited | Professional & scientific | 2024 |
| Bristol Suit Company Limited | Wholesale & retail | 2012 |
| Brit Freightways Ltd | Transport & logistics | 2025 |
| Britamerica Ventures Ltd | Manufacturing | 2025 |
| Britanica Trading Limited | Wholesale & retail | 2025 |
| Britannia Systems Group Limited | Information & communication | 2026 |
| Britannia Training & Consultancy Limited | Education | 2013 |
| Britco Sourcing Group (UK) Ltd | Wholesale & retail | 2025 |
| Briteson Limited | Other services | 2018 |
| British Automatic Fire Sprinkler Association Limited | Public administration | 1974 |
| British Cosmetic Dermatology Group Ltd | Other services | 2026 |
| British Judo Association(The) | Arts & recreation | 1978 |
| British Judo Trust | Arts & recreation | 2006 |
| British Optical Limited | Extraterritorial | 1991 |
| Britone Electronics Limited | Administrative & support | 2005 |
| Briwall Limited | Professional & scientific | 2005 |
| Broad & Hurst Limited | Extraterritorial | 2023 |
| Broad Health Solutions Ltd | Professional & scientific | 2025 |
| Broad Horizon Tuition Ltd | Education | 2021 |
| Broad Lane Masala Chippy Ltd | Hospitality | 2024 |
| Broad Lane Wines Ltd | Wholesale & retail | 2023 |
| Broadconcepts Advisory Limited | Professional & scientific | 2016 |
| Broadway Barbers Limited | Other services | 2025 |
| Broadway Booze & Convenience Ltd | Wholesale & retail | 2017 |
| Broadway Cleaning Services Ltd | Other services | 2013 |
| Broadway Construction (UK) Limited | Construction | 2014 |
| Broadway Kitchen Ltd | Hospitality | 2017 |
| Broadway Management Facilities Limited | Administrative & support | 2005 |
| Broadway Property Developments Limited | Real estate | 2015 |
| Broadway Rental Properties Limited | Real estate | 2017 |
| Broadway Residential Ltd | Real estate | 2018 |
| Broadway Security Limited | Administrative & support | 2024 |
| Broadway Training Limited | Professional & scientific | 1993 |
| Broadway UK Enterprise Ltd | Real estate | 2020 |
| Broadway Vape Shop Limited | Wholesale & retail | 2026 |
| Brocklehurst & Kerr Ltd. | Real estate | 1998 |
| Bromeliad Group Ltd | Professional & scientific | 2015 |
| Brompton House Limited | Health & social care | 2021 |
| Bromsgrove Care Ltd | Health & social care | 2026 |
| Brookes Media Management Ltd | Professional & scientific | 2024 |
| Brooks-Jinks Consultancy Limited | Professional & scientific | 2024 |
| Brookson (5032H) Limited | Administrative & support | 2007 |
| Broomfield Sports & Social Ltd | Hospitality | 2019 |
| Bropel Specialist Welders Limited | Administrative & support | 1973 |
| Brothers Group Holdings Limited | Real estate | 1999 |
| Brothers Leamore Ltd | Administrative & support | 2025 |
| Brown Brick Developments Ltd | Construction | 2018 |
| Brown CAD Services Ltd | Professional & scientific | 2019 |